from rest_framework.views import exception_handler
from rest_framework.response import Response
from rest_framework import status
from django.db import DatabaseError
from redis import RedisError

import logging


logger = logging.getLogger('django')


def custom_exception_handler(exc, context):
    """
    自定义异常处理
    :param exc:     异常类
    :param context: 抛出异常的上下文
    :return:        response响应对象
    """

    response = exception_handler(exc, context)

    if response is None:
        # 出现异常的视图类
        view = context['view']
        if isinstance(exc, DatabaseError) or isinstance(exc, RedisError):
            # 记录日志
            logger.error(f'[{view}]视图函数出现了[{exc}]异常!')

            response = Response({'message': '服务器内部错误！'}, status=status.HTTP_507_INSUFFICIENT_STORAGE)
    return response
